Earth2019s Crust Continuously Melts And Solidifies In The Upper Mantle. Why Does Oceanic Crust Solidify Faster Than Continental Crust?

Earth's crust continuously melts and solidifies in the upper mantle. Why does oceanic crust solidify faster than continental crust?

 

It is due to the process of subduction; oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper mantle (subduction). This is like a giant recycling system for the oceanic lithosphere.

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